Alarm device



Nov. 6, 1%? J "a c. e. TREFETHEN ALARM DEVICE Filed April 1, 1953 2Sheets-Sheet l Z 1 52:4. A /m/ 55E.

2 Sheets-Sheet 2 ALARM DEVICE R we C. (5. TREFETHEN Filed April 1, 1933ilml U Nov. 6, 1934*.

Unite st FFEQE s PArE'r ALARM nsvicn Charles Grant Trefethen, Worcester,Mass. Application April 1, 1933, Serial N0. 663,985

14 Claims. 01. 116-37) This invention relates to devices for soundingnism is mounted within a casing 12 slidable in an alarm when an attemptis made to open a e w -y 13 (F 3 in the base pl 0. window or door in anunauthorized manner, as The Casing is retained in the base plate by a 1by a locking-arm 14 mounted to rotate-with a 5 I is the general Object fmy invention to lock barrel 15 which is positioned in one end of '60vide improved devices for such purposes whereby the casmg 12 and isOperable by a removable a distinctive audible signal will be given whenan i g g i t j to tg g' attempt to open a door or window is made by an00 arm en pal S are p051 lone shown in Figs. 1 and 3 the casing 12cannot" unauthorized person. I also provide means by as r 10 which thealarm device may be rendered inopem be removed from the base plate 10without th 65 1,

' e b auth rize erson durin Jeriods when use of the key i g i s g 1 Ahammer is pivoted at 21 1n the casing 12 Further features of theinvention relate to and 1s movable by f g to Strlke and.eX means bywhich the device may be rendered inmode cattrldge C mounted m recess orsham operative from the outside of the door to which her 24 3 2) and l mvent P 25 itais attached for escaping gases.- The hammer 20 is provided,My invention further relates to arrangements Wlth holdmg arm or tngger27 normally seated w tch 2s (Fig.5) in a slide bar so. The andcombinations 01 parts which W111 oe heremno L after described and moreparticularly pointed out 30 f j slots h a M thetappended Claims. of thecas1ng 12 and lssupported on studs 01 75.;

Preferred forms of the invention are shown in crosspms E mountain. h f rthe drawings, in which At its outer end, the 511d; bar 30 has a pro ect-Fig. 1 is a side elevation, partly in section, g fi g ggg sg ig sag g gi g' g igi fi fi g g fi g a3 used m the 9 also provided with alongitudinalrecess 36 and 80:

Fig 2 is a plan View 6f the dev c partially with a transverse slot 87,also with a stop'pln 38 in one side thereof. broken W s m the dlrectmnof the When the locking arm 14'is swung to the dotarrow 2 in Fig. 1,

. ted line position indicated in Fig. 3, the arm 1e 36 v 3 an s, of i i100mg m extends into the slot 37 so that the slide bar'30' .dlrecpon ofW fi F is held from relative movement in the casing 12 paljnal P of a Pand consequently the'hammer 20 cannot be reloolnng in the direction or te arrow 4 1n Fl 3; leased when the locking arm 14. is in said dotted Fig5 1 a perspective View Of th sllde bar line position. Stop pins 39(Fig.3) limit swinging 35 f fa a hammer; movement of the locking arm 14in both di'r'ec- 90. 6 a perspefmve of the member tions and the stop pin38 limits the sliding movewhich actuates the slide bar to sound analarm; ment f the bar 't' Fig. "7 is a plan view showing the applica Anactuating member 40 (Fig. 6) is preferably of my inventlon far Protectmgdo)? Opening? secured in a recess in a side portion of the upper Fig. 8is an end View of the actuating member, Window Sash (Fig 1) and themember 40 is 95.5: looking in the direction of the arrow 8 in Fig. 7;provided w th a recess 41 having an dly Fig. 9 is a plan view of amodified construction and outwardly i lined upper surface 42 and a bedescribed; depending projection 43. The normal position Fig. 10 is afront elevation thereof, locking of th parts is as shown in Fj g 1 t thpro. 45 n e direction Of 1711-3 E-ITOW 10 in a jection 33 of the'slidebar 30 extending into the 109;

Fig. .11 is an end elevation, partly in section, recess 41 of thactuating member;- showing the application of this construction to Ifthe lower sash s is now raised, the upper an Outs de outer edge portionor corner of the projection 33 Referring particularly to Figs. 1 to 6, Ihave of the slide bar 30 will engage the inclined surshown my inventionas adapted to the protection face 42 and will be pushed; to the rightthereby of window openings. In this iorn1,my alarm de- (as viewed inFig. 1), by which movement the vice comprises a base plate 10 adapted tobe selongitudinal recess 36 will be moved under the cured to the upperedge of a lower window sash S trigger 2'7, thus releasing the hammer 20and and permanently secured thereto in a convencausing explosion of thecartridge C.

ient manner, as by screws 11. The alarm mecha- Furthermore, thedepending projection 43 of 11-03 the actuating member 40 will bereceived in the notch 34 in the upper side of the slide bar 30, so thatfurther opening movement of the sash S will be effectively preventedafter the alarm has been sounded.

In order to re-load and re-set the device, the bar 30 is pushed back toinitial position, the key 16 is inserted, and the locking arm 14 isswung to the dotted line position in Fig. 3,. thus releasing the casing12 from the base plate 10. The casing is then removed, the hammer 20 isreset in the position shown in Fig. 1, with the trigger 27 again seatedin the notch 28 of the slide bar 30, and a new cartridge C is insertedin the recess or opening 24. The casing is then returned and locked ininitial position, the key 16 is re. moved and the apparatus is again incondition for service.

If it is desired to render the alarm device inoperative at any time,this is readily accomplished by inserting the key 16, turning the lockarm 14 to the left in Fig. 3, thereby releasing the casing 12 andlocking the slide bar 30 and thereafter sliding the casing in itsguideways far enough to the right in Fig. 1 so that the projection 33 ofthe slide bar will clear the actuating member 40 in the upper sash S.The second notch 35 is provided to take care of cases in which it may bedesired to protect a member from movement in either of two reverseddirections. The actuating member 40 may be substantially varied in formand in the manner and location of its application to the sash S, so longas it provides a cam surface for engagement with the end of the slidebar 30. 1

In Figs. 7 and 8 I have shown the application of my invention to a doorD closing against a door jamb 50. For this purpose the casing 12 ismounted on the side of the door D opposite to the door jamb 50 and theactuating member 51 is attached to the door casing 52. r

The actuating member 51 is similar to the member 40 previously describedbut it is preferably provided with laterally extending ears 53 throughwhich screws 54 may be inserted for securing the member 51 to the doorcasing.

It is assumed that the alarm device is on the inside of the door, whereit cannot be reached by an unauthorized person who must attemptadmission by moving the door in the direction of the arrow at in Fig.'7. The device operates to sound the alarm in the same manner as theform of the invention shown in Figs. 1 to 6.

In Figs. 9, 10 and 11 I have shown an adaptation of my invention for useon an outside door D :The disc 65 has a pin 67 projecting into a slot 68in one of the guiding flanges 69 of the casing 60.

The hub portion 70 of the disc 65'projects into an opening in the door Dand is provided with a transverse rib 71 extending into a slot '12 inthe adjacent end of a rotatable member 73 associated with a lock 74mounted in the door D and having a lock plate '75 on the outer facethereof.

This lock '74 may be of any suitable commercial construction, it beingmerely desirable that one full revolution of a key in the lock 74 willcause a full revolution of the rotatable member 73, with a correspondingfull revolution of the disc 65. Initial rotation of the disc 65 movesthe casing 69 along the base plate 61 to an inoperative position.

The flange 69 of the casing 60 is provided with a notch (Fig. 10) whichreceives the pin 67 of the disc 65 when the disc 65 has made onecomplete revolution and after the casing 60 has been moved to the right(as viewed in Figs. 9 and 10) until it substantially engages the stop63.

Having made one complete revolution, the key may then be removed ifdesired. The stop 63 is so positioned that it is aligned with the slidebar 30 and prevents such movement of the bar as would release the hammer20 to sound an alarm while the device is in withdrawn position.

By this construction it is possible for an authorized person to withdrawthe alarm device from operative position while said person is located atthe outer side of the door D.

From the preceding description of several forms of my invention, it willbe evident that I have provided an extremely simple and reliable devicewhich a distinctive and audible alarm will be sounded whenever anattempt is made to open a door or window or other protected opening.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but what I claim is:-

1. An alarm device comprising a base plate to be mounted on a supportingmember, a casing movably mounted on said base plate, alarm mechanismmounted in said casing, an actuating member to be mounted on a secondsupporting memb r, relative movement of said supporting members causingsaid actuating member to engage and move an element of said alarmmechanism to thereby initiate an alarm, said casing being manuallyslidable on said base plate to remove said alarm mechanism to aninoperative position, and means to lock said casing in operativeposition on said base plate.

2. An alarm device comprising a base plate to be mounted on a supportingmember, a casing movably mounted on said base plate, alarm mechanismmounted in said casing, an actuating memb r to be mounted on a secondsupporting 125 member, relative movement of said supporting memberscausing said actuating member to engage and move an element of saidalarm mechanism to thereby initiate an alarm, said casing being manuallyslidable on said base plate to remove said ale. n mechanism to aninoperative position, and means to prevent operation of said alarmmechanism when said casing is removed from operative position.

3. An alarm device comprising a base plate to be mounted on supportingmember, a casing movably mounted on said base plate, alarm mechanismmounted in aid casing, an actuating member to be mounted on a secondsupporting member, relative movement of said supporting 140 memberscausing said actuating member to engage and move element of said alarmmechanism to thereby initiate an alarm, said casing being manuallyelidable on said base plate to remove said alarm mechanism to aninoperative 145 position, and a single means effective to lock saidcasing in operative position on said base plate and to lock said alarmmechanism in said casing when said casing is unlocked.

4. An alarm device comprising a base plate to 5 be mounted on asupporting member, a casing movably mounted on said base plate, alarmmechanism mounted in said casing, an actuating member to be mounted on asecond supporting member, relative movement of said supporting memberscausing said actuating member to engage and move an element of saidalarm mechanism to thereby initiate an alarm, said casing being manuallyslidable on said base plate to remove said alarm mechanism to aninoperative position, and a single means operative in one position tolock said casing to said base plate and in another position to lock saidalarm mechanism against operation in said casing.

5. An alarm device comprising a base plate to be mounted on a supportingmember, a casing movably mounted on said base plate, alarm mechanismmounted in said casing, an actuating member to be mounted on a secondsupporting member, relative movement of said supporting members causingsaid actuating member to engage and move an element of said alarm mechanism to thereby initiate an alarm, said casing being manually slidableon said base plate to remove said alarm mechanism to an inoperativeposition, and a locking means alternately operative to lock said casingto said base plate or to lock said alarm mechanism against operation insaid casing.

6. An alarm device comprising a base plate to be mounted on a supportingmember, a casing movably mounted on said base plate, alarm mechanismmounted in said casing, an actuating member to be mounted on a secondsupporting member, relative movement of said supporting members causingsaid actuating member to engage and move an element of said alarmmechanism to thereby initiate an alarm, said casing being manuallyslidable on said base plate to remove said alarm mechanism to aninoperative position, and means to lock said casing in operativeposition on said base plate, said latter means comprising a lock fixedin said casing and operable by a removable key and having a portioncoacting with said base plate.

'7. An alarm device comprising a base plate to be mounted on asupporting member, a casing movably mounted on said base plate, alarmmechanism mounted in said casing, an actuating member to be mounted on asecond supporting member, relative movement of said supporting memberscausing said actuating member to engage and move an element of saidalarm mechanism to thereby initiate an alarm, said casing being manuallyslidable on said base plate to remove said alarm mechanism to aninoperative position, and means to lock said casing in operativeposition on said base plate, said latter means comprising a lock fixedto said first supporting member and connections operable by said lockand eliective to slide said casing in said base plate.

8. An alarm device comprising a base plate to be mounted on a supportingmember, a casing movably mounted on said base plate, alarm mechanismmounted in said casing, an actuating member to be mounted on a secondsupporting member, relative movement of said supporting members causingsaid actuating member to engage and move an element of said alarmmechanism to thereby initiate an alarm, said casing being manuallyslidable on said base plate to remove said alarm mechanism to aninoperative position, and means to lock said casing in operativeposition on said base plate, said latter means comprising a lock fixedto said first supporting member on the opposite side from said alarmdevice, and connections from said lock to said casing through which saidlock is rendered effective to slide said casing in said base plate.

9. An alarm device comprising a base plate to be mounted on a supportingmember, a casing movably mounted on said base plate, alarm mechanismmounted in said casing, an actuating member to be mounted on a secondsupporting member, relative movement of said supporting members causingsaid actuating member to engage and move an element of said alarmmechanism to thereby initiate an alarm, said casing being manuallyslidable on said base plate to remove said alarm mechanism to aninoperative position, and means to lock said casing in operativeposition on said base plate, said latter means comprising a lock fixedto said first supporting member on the opposite side from said alarmdevice, and connections from said lock to said casing through which saidlock is rendered efiective to slide said casing in said base plate, andmeans on said base plate efiective to render said alarm mechanisminoperative when said casing is moved to extreme inoperative position.

10. An alarm mechanism comprising a casing, a cartridge mounted therein,a spring-actuated hammer pivoted in said casing, a trigger for saidhammer, a slide bar in said casing normally holding said trigger andhammer from operative movement, and cam means to move said slide bar andrelease said trigger to sound an alarm, the operating movement of saidcam means being in a direction substantially perpendicular to thereleasing movement of said slide bar.

11. The combination in an alarm device as set forth in claim 10, inwhich manual means is pro vided to lock said slide bar from longitudinalmovement.

12. The combination in an alarm device as set forth in claim 10, inwhich said casing is mounted on a base plate and in which manual meansis provided alternately efiective to lock said casing to said base plateor said slide bar in said casing.

13. An alarm mechanism comprising a casing, a cartridge mounted therein,a spring-actuated hammer pivoted in said casing, a trigger for saidhammer, a slide bar in said casing normally holding said trigger andhammer from operative movement, and cam means to move said slide bar andrelease said trigger to sound an alarm, said slide bar and cam meansmaintaining locking relation after movement of said slide bar by saidcam means.

14. An alarm device comprising a. base, an alarm mechanism supported bysaid base, an actuating member, and a lock efiective to secure saidalarm mechanism in a single predetermined operative position on saidbase, said alarm mechanism being freely movable to an inoperativeposition on said base when unlocked.

CHARLES GRANT TREFETI-IEN.

